Doomsday plane

If the United States ever ends up in a nuclear conflict, its military leaders may well conduct the war from the skies aboard what is known as the Doomsday plane, or, more formally, the National Airborne Operations Center.

Bockscar

This is Bockscar, the actual B-29 Superfortress that dropped the atomic bomb on Nagasaki, Japan, at the end of World War II. It is on exhibit at the National Museum of the United States Air Force, in Dayton, Ohio.

Memphis Belle restoration

This is the original Memphis Belle, which is being fully restored at the National Museum of the United States Air Force, in Dayton, Ohio. This plane was the first American bomber to successfully complete 25 missions during World War II, making it a perfect plane for promoting the war effort back home.

Huffman Prairie

The world's first airport was in this field, known as Huffman Prairie Flying Field, in Dayton, Ohio. There, the Wright brothers practiced putting their fledgling planes in the air by launching them using a catapult.

Goodyear zeppelin

Goodyear is getting ready to move from flying blimps -- which are essentially just huge airbags -- to Zeppelins, which have a hard airframe. Here, we see the construction of Goodyear's first zeppelin, at the company's airship operations headquarters, outside Akron, Ohio.

Nuclear bomber modification factory

Although it is now a giant gym, this building once was a factory where both Enola Gay, and Bockscar, the two B-29s that dropped atomic bombs on Japan to end World War II, were modified for those missions. The facility is located at Offutt Air Force Base, outside Omaha, Neb.